I believe it is possible to use photographs to get a rough measure of whether a person has Parkinson's. Visual changes may be apparent many years before the symptoms of the disease are enough to cause a person to go to a doctor. Such photographic detection is unlikely to be accurate enough to make a diagnosis in it itself, but it could be useful as an early warning indicator and as a research tool.

Many people would be able to provide a sequence of photographs of themselves for most years of their life. Using this sequence it may be possible to estimate when the disease started and, if we knew that, this would give clues as to what caused the disease.

We all change as we age. This "noise" is reduced by considering identical twins, using the non-PwP as the control.

Gerry, has anyone done this with you and your brother?

John